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2x+9+3x+x=7x+4
We move all terms to the left:
2x+9+3x+x-(7x+4)=0
We add all the numbers together, and all the variables
6x-(7x+4)+9=0
We get rid of parentheses
6x-7x-4+9=0
We add all the numbers together, and all the variables
-1x+5=0
We move all terms containing x to the left, all other terms to the right
-x=-5
x=-5/-1
x=+5
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